SQLite支持的表達(dá)式類型有哪些

這篇文章主要介紹SQLite支持的表達(dá)式類型有哪些，文中介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們一定要看完！

SQLite中的表達(dá)式

在SELECT的基本完整形式中，我們會(huì)看到幾乎是所有的子句都會(huì)使用到表達(dá)式。以下是SQLite支持的表達(dá)式類型。

expr binary-op expr |                                                                                                                //二元運(yùn)算符

expr [NOT] like-op expr [ESCAPE expr] |                                                                    //LIKE運(yùn)算符，匹配模式的一種

unary-op expr |                                                                                                                 //一元運(yùn)算符

( expr ) |                                                                                                                             //括號(hào)

column-name |                                                                                                                          //列名

table-name . column-name |                                                                                        //表名.列名

database-name . table-name . column-name |                                                                  //數(shù)據(jù)庫(kù)名.表名.列名

literal-value |                                                                                                                     //字面量

parameter |                                                                                                                       //差數(shù)形式

function-name ( expr-list | * ) |                                                                                       //函數(shù)

expr ISNULL |                                                                                                                   //處理NULL值

expr NOTNULL |                                                                                                              //非空

expr [NOT] BETWEEN expr AND expr |                                                                      //范圍

expr [NOT] IN ( value-list ) |                                                                                            //范圍

expr [NOT] IN ( select-statement ) |                                                                              //范圍

expr [NOT] IN [database-name .] table-name |                                                          //范圍

[EXISTS] ( select-statement ) |                                                                                       //存在

CASE [expr] ( WHEN expr THEN expr )+ [ELSE expr] END |                                  //條件結(jié)果

CAST ( expr AS type )                                                                                                     //轉(zhuǎn)換

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